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life & earth history


Continental Drift hypothesis stating that continents slowly drift parallel to Earth's surface
Uniformitarianism the idea that Earth's processes are at work today were also working on Earth in the past
Superposition the theory that undisturbed layers rock have the oldest on the bottom and the youngest on the top
Sedimentary Rock rock that is broken down into smaller pieces or that is dissolved in water
Pangaea ancient super continent that began breaking up about 200 million years ago
Plate Tectonics theory that explains how lithospheric plates move and interact, causing major geologic features and events
Fossil Record the history of all known fossils and their placements in the formation of rocks and positions in time
Absolute Dating calculated by using half-life of certain isotopes
Estimation an approximate calculation of quantity
Radioactive Decay when an unstable atomic nucleus changes another nucleus by emitting particle and energy
Igneous Rock rock that forms from magma or lava
Relative Dating age based on objects found at the same site
Half-life the time it takes a given amount of a radioactive isotope to decay to half its original mass
Atoms the smallest unit of matter, a nucleus surrounded by protons and electrons
Index Fossils the fossilized remains of an organism that existed over vast areas for a short period time
Created by: 200410974